95 arctic cat 580 pantera snowmobile is fuel injected has spark and fuel, fouls new plugs?

ran fine so far, then went to start it. it idle rough a few seconds the killed. the battery is fully charged. we have torched the plugs. then replaced them with new plugs it is getting spark, plenty of fuel. does not have an carburator it is fuel injected.|||If it is a two stroke, check your fuel/oil mixture. If it is electronic fuel injection there is a cold start sensor that may be telling the computer to run rich and you need a book to find out how to trouble shoot that. And last but nor least you may have a “runny nose” meaning an injector(s) that do not operate properly and need cleaning.